Appendix
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500
Voltages from 0…10 VDC
Before using the equation below, the hexadecimal or binary value has to be converted into a deci-
mal value.
The hexadecimal/binary value can easily be converted into a decimal value, because all numbers
belong to the positive range of the two’s complement.
The value range:
0…10 VDC
is displayed as follows:
0000
hex
…7FFF
hex (decimal:
0…32767)
The voltage value can now be calculated by means of the following equation:
Voltage values from -10 bis 10 V DC
Before using the equation below, the hexadecimal or binary value has to be converted into a deci-
mal value.
The hexadecimal/binary values for the negative value range cannot easily be converted into deci-
mal values, because the values are coded as two’s complement.
All numerical values from 00000
hex
… 7FFF
hex
represent positive values when coded as two’s com-
plement. Values in this range can easily be converted into decimal values. This is also relevant for
binary numbers in which the most significant bit (bit 16) is ”0”.
All numerical values from 8000
hex
…FFFF
hex
represent negative values when coded as two’s comple-
ment. This is also relevant for binary numbers in which the most significant bit (bit 16) is ”1”. Please
see Example of the conversion of negative numerical value, s. S. 496.
The value range:
-10 V…-3.052 10
-4
V
is displayed as follows:
8000
hex
…FFFF
hex
(decimal:-32768…-1)
The value range:
0 V…10 V
is displayed as follows:
0000
hex
…7FFF
hex
(decimal: 0…32767)
voltage value = 0.001526 mV x decimal value
voltage value = 4.88 × 10
-3
mV × decimal value
voltage value = 0.001526 mV × decimal value
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